Rhinoplasty¶

Nose reshaping targeting the nasal bridge, tip, and alar base.

Anatomy¶

Rhinoplasty modifies three sub-regions of the nose:

Alar base: nostrils narrowed toward the midline (landmarks 240, 236, 141, 363, 370 on the left; 460, 456, 274, 275, 278, 279 on the right)
Nasal tip: upward rotation and refinement (landmarks 1, 2, 94, 19)
Dorsum: bilateral narrowing of the nasal bridge (landmarks 195, 197, 236 left; 326, 327, 456 right)

Affected Landmarks¶

24 landmarks from the MediaPipe 478-point mesh:

[1, 2, 4, 5, 6, 19, 94, 141, 168, 195, 197, 236, 240, 274, 275, 278, 279, 294, 326, 327, 360, 363, 370, 456, 460]

Default influence radius: 30 px (at 512x512).

Displacement Behavior¶

Sub-region	Direction	Magnitude (at scale=1.0)	Radius factor
Left alar	+X (inward)	2.5 px	0.6x
Right alar	-X (inward)	2.5 px	0.6x
Tip	-Y (upward)	2.0 px	0.5x
Left dorsum	+X (inward)	1.5 px	0.5x
Right dorsum	-X (inward)	1.5 px	0.5x

All displacements scale linearly with intensity / 100.

Intensity Recommendations¶

Level	Intensity	Clinical analog
Conservative	20-35	Minor tip refinement
Moderate	40-65	Standard cosmetic rhinoplasty
Aggressive	70-100	Major reconstructive reshaping

Clinical Considerations¶

Ehlers-Danlos: influence radius increases to 45 px (1.5x), producing a wider zone of deformation around the nose.
Keloid-prone: if keloid_regions includes "nose", post-compositing mask transitions are softened in the nasal region.
Bell's palsy: not typically relevant for rhinoplasty, but if set, handles on the affected side are removed.

Code Example¶

from landmarkdiff.landmarks import extract_landmarks
from landmarkdiff.manipulation import apply_procedure_preset
from landmarkdiff.conditioning import render_wireframe

face = extract_landmarks(image_bgr)
deformed = apply_procedure_preset(face, "rhinoplasty", intensity=50)
wireframe = render_wireframe(deformed, width=512, height=512)

For data-driven mode with a fitted displacement model:

deformed = apply_procedure_preset(
    face,
    "rhinoplasty",
    intensity=60,
    displacement_model_path="data/hda_displacement_model.npz",
    noise_scale=0.2,
)